Hi,
Thanks for the information. That was sad to hear. In our case the traffic is
coming from servers and not a web browser so solving this with cookies are not
an option. The communication between the servers are based on international
standards as such we cannot add additional requirements to the server sending
the requests. As such we have to solve it within our infrastructure. With a
little help from HA-proxy you could then create very efficient local caches on
each node, but without we need complicated and resource intensive shared caches
or databases.
I hope this would be a feature that is possible to add in the future as it
would help to develop simpler and more efficient applications behind HA-Proxy,
which in large part can rely in local caches.
Best Regards,
Gisle
On 19/03/2018, 09:31, "Willy Tarreau" <w...@1wt.eu> wrote:
Hi,
On Fri, Mar 16, 2018 at 12:31:47PM +0000, Gisle Grimen wrote:
> Hi,
>
> We are using HA-Proxy with sticky routing in front of our cluster. Is
there a
> way to get HA-Proxy to add or set an header on a forwarded request when
> HA-Proxy "breaks" sticky routing i.e. when forwarding the request to
another
> server then the one indicated in the sticky table?
No, there is no such thing. You have this information in the logs however.
The difficulty lies with adding some information late in the LB+connection
process, as they happen after headers are processed. There is one exception
to this, "option http-send-name-header", which is able to rewind the stream
and insert a server name after the LB is performed, and it has been causing
tons of bugs alone for more than two years because it's very tricky.
I think that it would not be very difficult to implement something adding
a header containing the ID of the initial server that the stickiness was
expecting however. This way it could allow your servers to see that the
initial name is not the one they expected and deduce the stickiness is
broken. I don't know if that could suit your needs, nor if anyone would
be willing to work on this (maybe you would ?).
Regards,
Willy
